chore: replace deprecated PingCAP download domains

[wuhuizuo]

Summary

• replace deprecated download.pingcap.org references with download.pingcap.com
• replace deprecated charts.pingcap.org references with charts.pingcap.com where present
• keep the existing paths and protocols unchanged

Validation

• git diff --check
• verified no remaining download.pingcap.org / charts.pingcap.org references in the patched branch

[ti-chi-bot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[ti-chi-bot]

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[ti-chi-bot]

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[gemini-code-assist]

Code Review

This pull request updates download URLs from the .org domain to the .com domain across documentation and scripts. A security improvement was suggested to use HTTPS instead of HTTP for a specific download link to mitigate man-in-the-middle risks.

[gemini-code-assist]

For security reasons, it's strongly recommended to use https instead of http when downloading binaries. This helps prevent man-in-the-middle attacks where an attacker could substitute the binary with a malicious one.

Suggested change

	"http://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz"
	"https://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@7d85ef4). Learn more about missing BASE report.
⚠️ Report is 11 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

Components	Coverage Δ
cdc	∅ <ø> (?)
dm	49.1114% <ø> (?)
engine	50.7167% <ø> (?)

Flag	Coverage Δ
unit	49.5136% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

@@             Coverage Diff             @@
##             master     #12582   +/-   ##
===========================================
  Coverage          ?   49.5136%           
===========================================
  Files             ?        487           
  Lines             ?      70730           
  Branches          ?          0           
===========================================
  Hits              ?      35021           
  Misses            ?      32950           
  Partials          ?       2759           

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[ti-chi-bot]

@wuhuizuo: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-unit-test-cdc	cbe00c3	link	true	/test pull-unit-test-cdc
pull-dm-integration-test	cbe00c3	link	true	/test pull-dm-integration-test

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